ducky udcky dcuky cduky ucdky cudky dukcy udkcy dkucy kducy ukdcy kudcy dckuy cdkuy dkcuy kdcuy ckduy kcduy uckdy cukdy ukcdy kucdy ckudy kcudy ducyk udcyk dcuyk cduyk ucdyk cudyk duyck udyck dyuck yduck uydck yudck dcyuk cdyuk dycuk ydcuk cyduk ycduk ucydk cuydk uycdk yucdk cyudk ycudk dukyc udkyc dkuyc kduyc ukdyc kudyc duykc udykc dyukc ydukc uydkc yudkc dkyuc kdyuc dykuc ydkuc kyduc ykduc ukydc kuydc uykdc yukdc kyudc ykudc dckyu cdkyu dkcyu kdcyu ckdyu kcdyu dcyku cdyku dycku ydcku cydku ycdku dkycu kdycu dykcu ydkcu kydcu ykdcu ckydu kcydu cykdu yckdu kycdu ykcdu uckyd cukyd ukcyd kucyd ckuyd kcuyd ucykd cuykd uyckd yuckd cyukd ycukd ukycd kuycd uykcd yukcd kyucd ykucd ckyud kcyud cykud yckud kycud ykcud
Note: these 'words' (valid or invalid) are all the permutations of the word ducky. These words are obtained by scrambling the letters in ducky.